Please follow the next steps:
In PROCESSMAKER
1. ADMIN
2.PMTABLES
3.NEW/New PMTable
3.1. Complete data: ¨TABLE NAME¨/¨DESCRIPTION¨
3.2.Then, ¨Add Field¨
3.3.Fill in the fields and define the primary key, to just use type ¨INTEGER¨for ¨AUTO INCREMENT¨.